Which stable isotopes occur naturally in boron?

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A labeled diagram of the periodic table entry for boron shows its atomic number 5, symbol B, electron configuration, atomic weight range, and classification as a solid, weakly acidic, other nonmetal with a rhombohedral crystal structure at room temperature. — boron Properties of boron.

In nature, boron consists of a mixture of two stable isotopes: boron-10 and boron-11.1

Their approximate natural abundances are as follows:

Boron-10: 19.9 percent12
Boron-11: 80.1 percent12

These isotopes are distinguished by their nuclear properties, with boron-10 being particularly notable for its high capacity to capture thermal neutrons.1